Short diagnosis: Test subconical, high trochospiral coil of two to four whorls, three to six rapidly enlarging spherical chambers per whorl, umbilicus small and shallow, peripheral outline lobulate, periphery rounded; wall calcareous, hyaline, surface with rounded to elongate imperforate tubercles that may fuse into short costellae, wall perforate between tubercles; aperture an umbilical arch, with narrow bordering lip.

Geological Range: Last occurrence (top): within Valanginian Stage (133.88-139.39Ma, top in Valanginian stage). Data source: Total of range of species in this databaseFirst occurrence (base): within Bajocian Stage (168.28-170.30Ma, base in Bajocian stage). Data source: Total of range of species in this database

Plot of occurrence data:

NB Plotting of Neptune data has been disabled on the Mesozoic pages because the dataset is both small and badly affected by a few sites with erroneous age models (our obs Huber, Petrizzo, Young, Nov 2016). The data can still be viewed via the range plottertool - tools menu.